HalfLife: Decay Calculator

HalfLife turns a half-life, starting amount, and elapsed time into remaining amount, percent left, and a decay curve you can read at a glance.

What it helps with
- Remaining amount after any elapsed time.
- Reverse-solve elapsed time from a remaining amount.
- Isotope presets from Technetium-99m to Uranium-238.
- Half-life milestones at 1, 2, 3, 4, 5, and 10 half-lives.
- Saved scenarios for repeats you check often.